using System;
public class NotNullAtter:System.Attribute{
    
}

///列别名
public class ColumAtter:System.Attribute{
    private string name;
    private string types;
    public ColumAtter(string val)
    {
        this.name=val;
    }
    public ColumAtter(string val,string types){
        this.types=types;
    }
    public string getColumName(){
        return name;
    }
    public string getTypes(){
        return types;
    }
}